As Japanese dance-and-vocal group Bullet Train approaches its long-awaited Tokyo Dome concert, this documentary looks back on the journey that brought its members to this milestone. Newly filmed interviews are combined with footage from the group's past live performances, revealing the memories, ambitions, struggles, and personal feelings behind their rise. Created for the group's 15th anniversary, the film celebrates the bond between the members and their devoted fans as they prepare for the next chapter of their story.